Experimental Studies of Electron Affinity and Work Function from Aluminium on Oxidised Diamond (100) and (111) Surfaces
- M. C. James
- M. Cattelan
- N. A. Fox
- R. F. Silva
- R. M. Silva
- P. W. May
DOIAbstract
Three different procedures are used to deposit aluminium onto O-terminated (100) and (111) boron-doped diamond, with the aim of producing a thermally stable surface with low work function and negative electron affinity. The methods are 1) deposition of a > 20 nm film of Al by high-vacuum evaporation followed by HCl acid wash to remove excess metallic Al, 2) deposition of <3 Å of Al by atomic layer deposition, and 3) thin-film deposition of Al by electron beam evaporation. The surface structure, work function, and electron affinity are investigated after annealing at temperatures of 300, 600, and 800 °C. Except for loss of excess O upon first heating, the Al + O surfaces remain stable up to 800 °C. The electron affinity values are generally ...
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